Exact response pattern
554 5.7.9 Relay access deniedPermanentGenericRelay
What it means
The server will not relay this message for the current client or identity.
Likely causes
- Missing authentication.
- Client not in trusted network.
- Wrong relay host.
Recommended response
- Authenticate properly.
- Correct relay restrictions and client network settings.
Operational rule: Preserve the complete SMTP response, remote hostname, sending IP, envelope sender and timestamp. Never diagnose from the three-digit code alone.